Lepton flavour universality in rare b → s transitions is tested for the first time using B0s meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^−1. Branching fraction ratios between the B0s → ϕ e+ e− and B0s → ϕ μ+ μ− decays are measured in three regions of dilepton mass squared, q^2, with 0.1 < q^2 < 1.1, 1.1 < q^2 < 6.0, and 15 < q^2 < 19 GeV^2/c^4. The results agree with the Standard Model expectation of lepton flavour universality.

Aaij, R., Abdelmotteleb, A. . ., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. ., et al. (2025). Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays. PHYSICAL REVIEW LETTERS, 134(12), 1-15 [10.1103/physrevlett.134.121803].

Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

Lepton flavour universality in rare b → s transitions is tested for the first time using B0s meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^−1. Branching fraction ratios between the B0s → ϕ e+ e− and B0s → ϕ μ+ μ− decays are measured in three regions of dilepton mass squared, q^2, with 0.1 < q^2 < 1.1, 1.1 < q^2 < 6.0, and 15 < q^2 < 19 GeV^2/c^4. The results agree with the Standard Model expectation of lepton flavour universality.
2025
Aaij, R., Abdelmotteleb, A. . ., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. ., et al. (2025). Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays. PHYSICAL REVIEW LETTERS, 134(12), 1-15 [10.1103/physrevlett.134.121803].
Aaij, R.; Abdelmotteleb, A.  S.  W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1011614
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